ViewModel Store listener points to Controller method

I would like to add a listener to the ViewModel as a string. The string represents the method inside the ViewController / parent ViewController.

@example

ViewModel

data: {
    userData_: {id: 4}              // _ (Underscore) at end ==>  onUserDataChange method in controller
},
stores: {
    main: {
        module: MainStore,
        listeners: {
            load: 'onMainStoreLoad' // string => method in ViewController
        }
    }
}

ViewController

onUserDataChange(oldData, newData) {doYourStuff}

onMainStoreLoad(store, ...originalEvent) {doYourStuff}